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Mozilla has released the new update for Firefox web browser.They update two critical
security issues present in
Firefox 3.0.7 and
Mozilla recommends all Firefox users to upgrade to this latest release, that is
Firefox 3.0.8.Below is the two securiites fix :

• Title: XSL Transformation vulnerability

Impact: Critical
Announced: March 27, 2009
Reporter: Guido Landi, Andre, Michael Rooney, Martin
Products: Firefox, SeaMonkey

Fixed in: Firefox 3.0.8
SeaMonkey 1.1.16
Description

Security researcher Guido Landi discovered that a XSL stylesheet could be used to crash the browser during a XSL transformation. An attacker could potentially use this crash to run arbitrary code on a victim’s computer.

This vulnerability was also previously reported as a stability problem by Ubuntu community member, Andre. Ubuntu community member Michael Rooney reported Andre’s findings to Mozilla, and Mozilla community member Martin helped reduce Andre’s original testcase and contributed a patch to fix the vulnerability

• Title: Arbitrary code execution via XUL tree element

Impact: Critical
Announced: March 27, 2009
Reporter: Nils
Products: Firefox

Fixed in: Firefox 3.0.8
Description

Security researcher Nils reported via TippingPoint’s Zero Day Initiative that the XUL tree method _moveToEdgeShift was in some cases triggering garbage collection routines on objects which were still in use. In such cases, the browser would crash when attempting to access a previously destroyed object and this crash could be used by an attacker to run arbitrary code on a victim’s computer.

This vulnerability was used by the reporter to win the 2009 CanSecWest Pwn2Own contest.

This vulnerability does not affect Firefox 2, Thunderbird 2, or released versions of SeaMonkey.

More information about the release and download  available here.